The Patek Philippe 5167/1A – Aquanaut features a mechanical movement with automatic winding, Caliber 26‑330 S C, and includes a date function with central seconds. Its black embossed dial complements the stainless steel case (40.8 mm diameter, 8.1 mm height) with water resistance up to 30 meters, a screw-down crown, and a sapphire crystal case back. Completed with a stainless steel bracelet and Aquanaut folding clasp, this timepiece balances functionality with a sleek, sporty design.